root/ext/zip/lib/zip_string.c

DEFINITIONS

1. _zip_string_crc32
2. _zip_string_equal
3. _zip_string_free
4. _zip_string_get
5. _zip_string_length
6. _zip_string_new
7. _zip_string_write

   1 /*
   2   zip_string.c -- string handling (with encoding)
   3   Copyright (C) 2012-2014 Dieter Baron and Thomas Klausner
   4 
   5   This file is part of libzip, a library to manipulate ZIP archives.
   6   The authors can be contacted at <libzip@nih.at>
   7 
   8   Redistribution and use in source and binary forms, with or without
   9   modification, are permitted provided that the following conditions
  10   are met:
  11   1. Redistributions of source code must retain the above copyright
  12      notice, this list of conditions and the following disclaimer.
  13   2. Redistributions in binary form must reproduce the above copyright
  14      notice, this list of conditions and the following disclaimer in
  15      the documentation and/or other materials provided with the
  16      distribution.
  17   3. The names of the authors may not be used to endorse or promote
  18      products derived from this software without specific prior
  19      written permission.
  20  
  21   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  22   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  25   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  29   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  30   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  31   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32 */
  33 
  34 
  35 #include <stdlib.h>
  36 #include <string.h>
  37 
  38 #include "zipint.h"
  39 
  40 
  41 zip_uint32_t
  42 _zip_string_crc32(const zip_string_t *s)
  43 {
  44     zip_uint32_t crc;
  45     
  46     crc = (zip_uint32_t)crc32(0L, Z_NULL, 0);
  47 
  48     if (s != NULL)    
  49         crc = (zip_uint32_t)crc32(crc, s->raw, s->length);
  50 
  51     return crc;
  52 }
  53 
  54 
  55 int
  56 _zip_string_equal(const zip_string_t *a, const zip_string_t *b)
  57 {
  58     if (a == NULL || b == NULL)
  59         return a == b;
  60 
  61     if (a->length != b->length)
  62         return 0;
  63 
  64     /* TODO: encoding */
  65 
  66     return (memcmp(a->raw, b->raw, a->length) == 0);
  67 }
  68 
  69 
  70 void
  71 _zip_string_free(zip_string_t *s)
  72 {
  73     if (s == NULL)
  74         return;
  75 
  76     free(s->raw);
  77     free(s->converted);
  78     free(s);
  79 }
  80 
  81 
  82 const zip_uint8_t *
  83 _zip_string_get(zip_string_t *string, zip_uint32_t *lenp, zip_flags_t flags, zip_error_t *error)
  84 {
  85     static const zip_uint8_t empty[1] = "";
  86 
  87     if (string == NULL) {
  88         if (lenp)
  89             *lenp = 0;
  90         return empty;
  91     }
  92 
  93     if ((flags & ZIP_FL_ENC_RAW) == 0) {
  94         /* start guessing */
  95         if (string->encoding == ZIP_ENCODING_UNKNOWN)
  96             _zip_guess_encoding(string, ZIP_ENCODING_UNKNOWN);
  97 
  98         if (((flags & ZIP_FL_ENC_STRICT)
  99              && string->encoding != ZIP_ENCODING_ASCII && string->encoding != ZIP_ENCODING_UTF8_KNOWN)
 100             || (string->encoding == ZIP_ENCODING_CP437)) {
 101             if (string->converted == NULL) {
 102                 if ((string->converted=_zip_cp437_to_utf8(string->raw, string->length,
 103                                                           &string->converted_length, error)) == NULL)
 104                     return NULL;
 105             }
 106             if (lenp)
 107                 *lenp = string->converted_length;
 108             return string->converted;
 109         }
 110     }
 111     
 112     if (lenp)
 113         *lenp = string->length;
 114     return string->raw;
 115 }
 116 
 117 
 118 zip_uint16_t
 119 _zip_string_length(const zip_string_t *s)
 120 {
 121     if (s == NULL)
 122         return 0;
 123 
 124     return s->length;
 125 }
 126 
 127 
 128 zip_string_t *
 129 _zip_string_new(const zip_uint8_t *raw, zip_uint16_t length, zip_flags_t flags, zip_error_t *error)
 130 {
 131     zip_string_t *s;
 132     zip_encoding_type_t expected_encoding;
 133     
 134     if (length == 0)
 135         return NULL;
 136 
 137     switch (flags & ZIP_FL_ENCODING_ALL) {
 138     case ZIP_FL_ENC_GUESS:
 139         expected_encoding = ZIP_ENCODING_UNKNOWN;
 140         break;
 141     case ZIP_FL_ENC_UTF_8:
 142         expected_encoding = ZIP_ENCODING_UTF8_KNOWN;
 143         break;
 144     case ZIP_FL_ENC_CP437:
 145         expected_encoding = ZIP_ENCODING_CP437;
 146         break;
 147     default:
 148         zip_error_set(error, ZIP_ER_INVAL, 0);
 149         return NULL;
 150     }
 151         
 152     if ((s=(zip_string_t *)malloc(sizeof(*s))) == NULL) {
 153         zip_error_set(error, ZIP_ER_MEMORY, 0);
 154         return NULL;
 155     }
 156 
 157     if ((s->raw=(zip_uint8_t *)malloc((size_t)(length+1))) == NULL) {
 158         free(s);
 159         return NULL;
 160     }
 161 
 162     memcpy(s->raw, raw, length);
 163     s->raw[length] = '\0';
 164     s->length = length;
 165     s->encoding = ZIP_ENCODING_UNKNOWN;
 166     s->converted = NULL;
 167     s->converted_length = 0;
 168 
 169     if (expected_encoding != ZIP_ENCODING_UNKNOWN) {
 170         if (_zip_guess_encoding(s, expected_encoding) == ZIP_ENCODING_ERROR) {
 171             _zip_string_free(s);
 172             zip_error_set(error, ZIP_ER_INVAL, 0);
 173             return NULL;
 174         }
 175     }
 176     
 177     return s;
 178 }
 179 
 180 
 181 int
 182 _zip_string_write(zip_t *za, const zip_string_t *s)
 183 {
 184     if (s == NULL)
 185         return 0;
 186     
 187     return _zip_write(za, s->raw, s->length);
 188 }